Vivo iQOO 15 Ultra vs Vivo X21i
The Vivo iQOO 15 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite Gen 5, while the Vivo X21i (2018) runs on the MediaTek Helio P60. By overall MobileRank rating, the Vivo iQOO 15 Ultra leads — 84/100 vs 8/100 (a 76-point difference). Key differences: the Vivo iQOO 15 Ultra has the bigger battery (7400 mAh vs 3425); the main camera is 50 MP vs 12 MP; the Vivo iQOO 15 Ultra is faster in AnTuTu (4,602,290 vs 232,802); the Vivo iQOO 15 Ultra has NFC for contactless payments, the Vivo X21i doesn't; the Vivo X21i is noticeably lighter (159g vs 227g).
Vivo iQOO 15 Ultra
Vivo X21i
- Higher AnTuTu: 4602290 vs 232802
- Better Geekbench Single: 3640 vs 341
- Better Geekbench Multi: 11033 vs 779
- Bigger battery: 7400 vs 3425 mAh
- Better main camera: 50MP vs 12MP
- Higher performance (97/100 vs 0/100)
- Better camera (74/100 vs 6/100)
- Longer battery life (86/100 vs 0/100)
- Better display (100/100 vs 0/100)
- Lighter: 159g vs 227g
- Better design/ergonomics (100/100 vs 16/100)
Comparing the Vivo iQOO 15 Ultra vs the Vivo X21i, the Vivo iQOO 15 Ultra scores 76 points higher (84/100 vs 8/100). In the "performance" category, the Vivo iQOO 15 Ultra leads (97/100 vs 0/100). In the "camera" category, the Vivo iQOO 15 Ultra leads (74/100 vs 6/100). In the "battery" category, the Vivo iQOO 15 Ultra leads (86/100 vs 0/100). In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (97/100 vs 0/100). In the "display" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (100/100 vs 0/100). In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (74/100 vs 6/100). In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (86/100 vs 0/100). In the "design" category, the Vivo X21i significantly outperforms the Vivo iQOO 15 Ultra (100/100 vs 16/100). In the "value for money" category, both devices are on the same level — 55/100.
| Specification | Vivo iQOO 15 Ultra | Vivo X21i | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 8 Elite Gen 5 | MediaTek Helio P60 | |
| AnTuTu | 4602290 | 232802 | |
| Geekbench Single | 3640 | 341 | |
| Geekbench Multi | 11033 | 779 | |
| Display | 6.8" LTPO AMOLED | 6.3" Super AMOLED | |
| Resolution | 1440x3168 | 1080x2280 | |
| Refresh rate | 144 Hz | — | |
| Battery | 7400 mAh | 3425 mAh | |
| Charging | 120W | — | |
| Wireless charging | 50W | 0W | |
| Main camera | 50 MP | 12 MP | |
| Ultrawide | 50 MP | 0 MP | |
| Telephoto | 50 MP | 0 MP | |
| Front camera | 32 MP | 24 MP | |
| RAM | 12GB / 16GB / 24GB | 4GB / 6GB | |
| Storage | 256GB / 512GB / 1TB | 64GB / 128GB | |
| OS | Android 16 | Android 8.1 (Oreo); Funtouch 4 | |
| Brightness (peak) | 8000 nits | — | |
| NFC | yes | no | |
| Protection | IP68 | — | |
| Dimensions | 163.7×76.8×8.7 mm | 154.4×75.0×7.0 mm | |
| Weight | 227 g | 159 g | |
| Price | $799 | — |
Vivo iQOO 15 Ultra
- Main: 50MP f/f/1.9
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 32MP
Vivo X21i
- Main: 12MP f/f/1.8
- Front: 24MP
Vivo iQOO 15 Ultra
- 6.8" LTPO AMOLED
- Resolution: 1440x3168
- Refresh rate: 144 Hz
Vivo X21i
- 6.3" Super AMOLED
- Resolution: 1080x2280
- Refresh rate: —
Vivo iQOO 15 Ultra
- 7400 mAh
- Wired: 120W
- Wireless: 50W
Vivo X21i
- 3425 mAh
- No wireless charging
We compared Vivo iQOO 15 Ultra and Vivo X21i, covering their specs and all relevant benchmarks.
Vivo iQOO 15 Ultra leads Vivo X21i by 1876.9% in our overall performance rating.
Vivo X21i
Price unknownperformance
In the "performance" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (97/100 vs 0/100).
display
In the "display" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (100/100 vs 0/100).
camera
In the "camera" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (74/100 vs 6/100).
battery
In the "battery" category, the Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i (86/100 vs 0/100).
design
In the "design" category, the Vivo X21i significantly outperforms the Vivo iQOO 15 Ultra (100/100 vs 16/100).
value for money
In the "value for money" category, both devices are on the same level — 55/100.
Which is better: the Vivo iQOO 15 Ultra or the Vivo X21i?
The Vivo iQOO 15 Ultra significantly outperforms the Vivo X21i by 76 points (84/100 vs 8/100).
What is the rating of the Vivo iQOO 15 Ultra and the Vivo X21i?
The Vivo iQOO 15 Ultra has a MobileRank rating of 84/100, the Vivo X21i — 8/100.
Which has the better camera: the Vivo iQOO 15 Ultra or the Vivo X21i?
The Vivo iQOO 15 Ultra leads on camera score (74/100 vs 6/100).
Which is more powerful: the Vivo iQOO 15 Ultra or the Vivo X21i?
The Vivo iQOO 15 Ultra leads on performance (97/100 vs 0/100).
Should you choose the Vivo iQOO 15 Ultra over the Vivo X21i?
The Vivo iQOO 15 Ultra is a better fit for gamers and power users, those who care about battery life. The Vivo X21i is a better fit for everyday use.